Abstract
A new photo thermal refractive glass system is introduced. Glasses in the system Na2O/K2O/CaO/CaF2/Al2O3/SiO2 were doped with Ag2O, CeO2, KBr, SnO2 and Sb2O3. They were irradiated with UV light and subsequently thermally annealed at 530 °C, a temperature just above Tg. This led to a slightly yellow coloration. A second thermal annealing step at a temperature of 560 °C led to the crystallization of cubic CaF2 as proved by x-ray diffraction. Samples, annealed in a two step process at 530 °C for 1 h and 560 °C for 20 h without previous irradiation did not show crystallization. Furthermore, the effect of irradiation time on crystallization behavior and the role of KBr in the photoinduced crystallization process were also investigated.
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